Find the 22nd term of the arithmetic sequence whose common difference is d =3 and whose first term is a_1=-20

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Find the 22nd term of the arithmetic sequence whose common difference is d =3 and whose first term is a_1=-20

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Thu Thảo 3 years 2021-08-17T14:49:48+00:00 1 Answers 5 views 0

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    2021-08-17T14:51:03+00:00

    1,4,7,10,13,16,19,22,25,28,31,34,37,40,43,46,49,52,55,58,61,64,67,70,73,76,79,82,85,88,91,94,97,100

    f(n) = 1 + 3(n-1) = 1 + 3n – 3 = 3n -2

    f(22) = 3(22)-2 = 66-2 = 64

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